The Castle of San Nicola de Thoro Plano sits on the summit of the hill that overlooks the districts of Accola and Carpineto. It was more than just a castle, it was a fortress, a bastion, a place of refuge for the population of the town below against Longobard and pirate attacks.
According to Cerasuoli, building began after the death of Sicardo, Longobard Duke of Benevento in 840 AD. Sicardo had devestated many of the towns and settlements on the Amalfi Coast.Work on the building developed round an existing church dedicated to San Nicola de Thoro Plano. The building underwent modifications by the Piccolimini Dukes, who in 1461 had been nominated as governors of the Duchy of Amalfi by Ferdinando I of Aragon.
The work started in 1465 and lasted until 1468 at a cost to the town of 6000 ducats. The fort enclosed an existing three aisle church, and the term Thoro Plano means a small hill placed against a taller elevation, Thorus Clivius, where the districts of Campo and Paie were situated.Inside the castle there were barracks, refuge for the population, cisterns and stores which guaranteed water and food supplies in case of invasion. The building preserves its original rectangular polygon shaped perimeter which is 550 metres long. The barrier walls are interspaced with nine round towers, which are eight metres high and five metres in diameter.
References:The Chapel of St. Martin is the only completely preserved Romanesque building in Vyšehrad and one of the oldest in Prague. In was built around 1100 in the eastern part of the fortified outer ward. Between 1100 and 1300, the Rotrunda was surrounded by a cemetery. The building survived the Hussite Wars and was used as the municipal prison of the Town of the Vyšehrad Hill.
During the Thirty Years’ War, it was used as gunpowder storage, from 1700 to 1750, it was renovated and reconsecrated. In 1784, the chapel was closed passed to the military management which kept using it as a warehouseand a cannon-amunition manufacturing facility. In 1841, it was meant to be demolished to give way to the construction of a new road through Vyšehrad. Eventually, only the original western entrance was walled up and replaced with a new one in the sountren side. The dilapidating Rotunda subsequently served as a shelter for the poor.